272 Albany Miiseiim Iti'cords. 



length from the canine to the foui-th molar inclusive is 10.4 mm. 

 The line of the outer side of the molars when continued forms a 

 tangent to the inner side of the canine. 



The greatest "width of the snout is estimated to have been 

 about 25 mm. The length of the palate from the front of the 

 snout to the end of the hard palate has probably been about 35 

 mm., and the length from the anterior end of the snout to the 

 front of the orbit probal)ly, about the same. 



Unfortunatelj" none of the crowns are preserved and it is 

 impossil)le to be certain if the species should be referred to 

 TriracJiodon^ but so far as preserved the agreement with that 

 genus is sufficiently close to render it advisable to place it pro- 

 visionally in that genus. 



In a second specimen of the same species there are seven 

 molai'S which measure 1(S.5 mm. The crowns are not well pre- 

 served but appear to agree with those of Tri racliodon. 



Sesamodon Broitmi, g.n. et sp. n. 



In the collection are two imperfect skulls and a few fragments 

 of jaws of a small Thi'riodoiif-Mke reptile. In general the form 

 bears some resemblance to Trirachodon, but differs markedly in 

 the structure of the teeth. The length of the snout to the front of 

 the orbit is estimated to be labout 36 mm. The nasal bones are 

 broader in front than behind, and there is no evidence of there 

 having been an internasal premaxillary process. A well developed 

 secondary palate is present. 



There are four upper incisors of which only the roots are 

 preserved. It is probable, however, that the iucisors were pointed, 

 and they were certainly not persistent. The length of the four 

 incisoi'S is about 13 mm. Behind the 1th incisor is a diastema of 

 (J mm. The canine is not much larger than the incisor and is 

 moderately round on section. It measures about 3-5 mm. by 1 mm. 

 About 1-5 ram. behind and somewhat internal to 'it is a rudi- 

 mentary molar or premolar about 1 mm. in diameter. Following 

 this is a short diastema of 2 mm. and then follow six well 

 developed molars. The first of the six is comparatively small, but 

 the molars increase in size to the ith. The 5th is about the same 



